Join Date: Oct 2009
Location: Just south of sanity
I'm a little confused.
Are you trying to sell the horse now, or are you trying to purchase an animal from someone who said that you have to give the previous owner first right of refusal?
If you're planning to sell the horse and decided that you'd honor the first right of refusal clause, which BTW legally you don't have to, then you've done your due diligence by sending the certified letter.
First rights of refusal aren't legally binding, even if they're in a contract. Once you've paid money for something, it becomes yours to do with as you wish. First rights of refusal notifications fall under moral obligations, not legal ones.
You're in the clear, and may proceed as planned.